Homekit-color issue

Hi there, I have a small problem with Homekit. When I add the switchable items to homekit it works like charm, but when I try to add a color item to homekit, I get an error message “Could not handle request…” Is there some problem in the binding or do I have any problem in my code ? Thanks much for your help

Color RGB		  "RGBLight" ["Lighting"]
Colorpicker item=RGB

[details=Error Code]17:49:13.860 [ERROR] [lfe.hap.impl.connections.HttpSession] - Could not handle request
java.lang.NullPointerException
at com.beowulfe.hap.characteristics.FloatCharacteristic.getValue(FloatCharacteristic.java:72)[210:org.openhab.io.homekit:2.0.0]
at com.beowulfe.hap.characteristics.BaseCharacteristic.makeBuilder(BaseCharacteristic.java:71)[210:org.openhab.io.homekit:2.0.0]
at com.beowulfe.hap.characteristics.FloatCharacteristic.makeBuilder(FloatCharacteristic.java:48)[210:org.openhab.io.homekit:2.0.0]
at com.beowulfe.hap.characteristics.BaseCharacteristic.toJson(BaseCharacteristic.java:61)[210:org.openhab.io.homekit:2.0.0]
at com.beowulfe.hap.impl.json.AccessoryController.toJson(AccessoryController.java:73)[210:org.openhab.io.homekit:2.0.0]
at com.beowulfe.hap.impl.json.AccessoryController.listing(AccessoryController.java:39)[210:org.openhab.io.homekit:2.0.0]
at com.beowulfe.hap.impl.connections.HttpSession.handleAuthenticatedRequest(HttpSession.java:70)[210:org.openhab.io.homekit:2.0.0]
at com.beowulfe.hap.impl.connections.ConnectionImpl.doHandleRequest(ConnectionImpl.java:51)[210:org.openhab.io.homekit:2.0.0]
at com.beowulfe.hap.impl.connections.ConnectionImpl.handleRequest(ConnectionImpl.java:46)[210:org.openhab.io.homekit:2.0.0]
at com.beowulfe.hap.impl.http.impl.AccessoryHandler.channelRead0(AccessoryHandler.java:47)[210:org.openhab.io.homekit:2.0.0]
at com.beowulfe.hap.impl.http.impl.AccessoryHandler.channelRead0(AccessoryHandler.java:15)[210:org.openhab.io.homekit:2.0.0]
at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:105)[210:org.openhab.io.homekit:2.0.0]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:308)[210:org.openhab.io.homekit:2.0.0]
at io.netty.channel.AbstractChannelHandlerContext.access$600(AbstractChannelHandlerContext.java:32)[210:org.openhab.io.homekit:2.0.0]
at io.netty.channel.AbstractChannelHandlerContext$7.run(AbstractChannelHandlerContext.java:299)[210:org.openhab.io.homekit:2.0.0]
at io.netty.util.concurrent.DefaultEventExecutor.run(DefaultEventExecutor.java:36)[210:org.openhab.io.homekit:2.0.0]
at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:112)[210:org.openhab.io.homekit:2.0.0]
at io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:137)[210:org.openhab.io.homekit:2.0.0]
at java.lang.Thread.run(Thread.java:745)[:1.8.0_121]
[/details]